/* roulang page: index */
:root {
      --bg-dark: #0B0F19;
      --card-bg: rgba(17, 24, 39, 0.72);
      --border-line: rgba(255, 255, 255, 0.08);
      --accent-cyan: #00D2FF;
      --accent-blue: #0066FF;
    }
    body {
      background-color: var(--bg-dark);
      color: #E2E8F0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      overflow-x: hidden;
    }
    .glass-panel {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-line);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glass-panel:hover {
      border-color: rgba(0, 210, 255, 0.4);
      transform: translateY(-3px);
    }
    .glow-btn {
      background: linear-gradient(135deg, #0066FF, #00D2FF);
      box-shadow: 0 0 20px rgba(0, 210, 255, 0.35);
      transition: all 0.3s ease;
    }
    .glow-btn:hover {
      box-shadow: 0 0 30px rgba(0, 210, 255, 0.65);
      transform: translateY(-2px);
    }
    .text-gradient {
      background: linear-gradient(135deg, #FFFFFF 30%, #00D2FF 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    .tab-content {
      display: none;
    }
    .tab-content.active {
      display: block;
    }